@kingstinct/react-native-healthkit/src/hooks/useMostRecentWorkout.ts

React Native bindings for HealthKit

import { useCallback, useEffect, useRef, useState } from 'react'
import type { WorkoutProxy } from '../specs/WorkoutProxy.nitro'
import getMostRecentWorkout from '../utils/getMostRecentWorkout'
import useSubscribeToChanges from './useSubscribeToChanges'

/**
 * @returns the most recent workout sample.
 */
export function useMostRecentWorkout(options?: {
  readonly energyUnit?: string
  readonly distanceUnit?: string
}) {
  const [workout, setWorkout] = useState<WorkoutProxy>()

  const optionsRef = useRef(options)

  useEffect(() => {
    optionsRef.current = options
  }, [options])

  const update = useCallback(async () => {
    setWorkout(
      await getMostRecentWorkout({
        energyUnit: optionsRef.current?.energyUnit,
        distanceUnit: optionsRef.current?.distanceUnit,
      }),
    )
  }, [])

  useEffect(() => {
    void update()
  }, [update])

  useSubscribeToChanges('HKWorkoutTypeIdentifier', update)

  return workout
}

export default useMostRecentWorkout